Gripping means for bench pipe-threaders.



' W.- L. GOODMA'PT GRIPPING MEANS FOR BENCH PIPE THREADERS. PPLIOATI'ON nLEn nmm, 191i.

1,047,932. I Patented Dec. 24,1912.

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To all whom it may concern:

Be it known that I", WILLIAM 'L. GoonarAN, a'citizen of the United States, residmg at Coalmga, in the county of 'Fresno,

State .of California, have-invented certain new and useful Improvements in Gripping Means for Bench Pipe-Threaders; and I do declare the following to be a full, clear,and exact description of the same, such as will enable others skilled in the art to which it 'apperta-ins to make and use the same, reference. being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part ofthis application. i

This invention relates to improvements in pipe threaders and particularly to bench pipe threaders of all descriptions, the object of the invention being to produce a gripping means fora pipe which will hold the same securely in the stock of the tool for the threading operation, which gripping means will automatically during the gripping operation force the pipe to an absolutely true centered position as is 'necessary to the successful operation of the tool. A further object of the invention is to .produce a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for which it is designed.

These objects, I accomplish by means of.

such structure and relative arrangement of parts as willfully-appear. by a'perusal of the following specificati'on and claims.

In the drawings similar'characters of reference indicate corresponding parts in the several views.

Figure 1 is a side elevation of the complete device. Fig. 2 is an end elevation of the same. i

Referring now more particularly to the characters of reference on the drawings, 1

designates the stock of the machine and 2 the usual operating gear thereon.

In applying my improved invention I first provide a tubular member or sleeve 3 mounted over which is another sleeve 4 provided on its edges with gears 5" and having an operating handle member 6 to be used for turning said sleeve 4.

The numeral 7 designates lugs which may I hold the sleeve 4 in proper position on the 1 member 3. l

Specification of Letters f ajtnt. Application filed December 21, 1911'. Serial a... 667,181."

, 13 on the member 3 whereby with the'revolution of the gears 9 said set screws 11 will be moved inwardly or outwardly. Hence r Pateht-e iIE 91 I when it is desired to set the pipe 14 into the machine for the purpose of threading it, it is inserted through the sleeve ,3 and then "the member 6 is used to turn the sleeve 4 which causes 5 to turn the gear 9, which operation moves all of the said screws 11 into the sleeve 3 each the same distance and hence when the same grip the pipe 14 they force the same to the exact center of the.

machine as is necessary for a perfect operation. e

From the foregoing'description it will be readily seen that I have produced such a device as substantially fulfils the object of the invention as set forth herein.

\Vhile this specification setsforth in detail the present and preferred construction of-the device, still in practice such devia-' tions from such detail may be resorted to as donot form a departure from the spirit of the invention.

Having thus described my invention what I claim as new and useful and desire to secure by Letters. Patent is 1. A device of the character described comprising the combination with a pipe threading machine of a sleeve mounted thereon, threaded set screws disposed through said sleeve, means for preventing said set screw from turning, another sleeve mounted over saidfirs't named sleeve and being provided with teeth on its edge, boxes bolted to said first named sleeve and having.

projecting lips extending over said second named sleeve, gears disposed in said boxes and being screw mounted onthe threads of said set screws, the teethon'said second named 'sleeve engaging said gears, as described.

2. A device of-the character described comprising the combination with a pipe threading machine with a sleeve mounted thereon, of set screws movable through said screws, and means for turning said sleeve, sleeve and provided with key-ways, keys on as described. said sleeve adapted to engage said key-ways,

gears disposed around said set screws, an- M GOODMAN other sleeve mounted on said first named Witnesses: sleeve and being geared on its edge, said B. F. DAVENPORT,

geared edge engagingt-he gears on'said set H. C. LANDER. 

